<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../js/jquery.min.js"></script>
</head>

<body>
  <form id="f1">
    <input type="text" name="username">
    <input type="password" name="password">
    <button type="submit">提交</button>
  </form>
  <script>
    $(() => {
      $("#f1").on('submit', function (e) {
        e.preventDefault()
        const Data = new FormData(this)
        console.log(Data)
        const data = $(this).serialize()
        // console.log(data)
      })
    })
  </script>
</body>

</html>